ARM: davinci: convert to common sched_clock() implementation
Davinci has its own sched_clock() implementation, which gets in the
way of a single zImage. Moving to the common sched_clock framework
makes the code slightly cleaner.
Acked-by: Sekhar Nori <nsekhar@ti.com>
Cc: Kevin Hilman <khilman@ti.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
diff --git a/arch/arm/mach-davinci/time.c b/arch/arm/mach-davinci/time.c
index f2afb2d..75da315 100644
--- a/arch/arm/mach-davinci/time.c
+++ b/arch/arm/mach-davinci/time.c
@@ -19,6 +19,7 @@
#include <linux/err.h>
#include <linux/platform_device.h>
+#include <asm/sched_clock.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
@@ -274,19 +275,9 @@
return (cycles_t)timer32_read(t);
}
-/*
- * Kernel assumes that sched_clock can be called early but may not have
- * things ready yet.
- */
-static cycle_t read_dummy(struct clocksource *cs)
-{
- return 0;
-}
-
-
static struct clocksource clocksource_davinci = {
.rating = 300,
- .read = read_dummy,
+ .read = read_cycles,
.mask = CLOCKSOURCE_MASK(32),
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
@@ -294,12 +285,9 @@
/*
* Overwrite weak default sched_clock with something more precise
*/
-unsigned long long notrace sched_clock(void)
+static u32 notrace davinci_read_sched_clock(void)
{
- const cycle_t cyc = clocksource_davinci.read(&clocksource_davinci);
-
- return clocksource_cyc2ns(cyc, clocksource_davinci.mult,
- clocksource_davinci.shift);
+ return timer32_read(&timers[TID_CLOCKSOURCE]);
}
/*
@@ -399,12 +387,14 @@
davinci_clock_tick_rate = clk_get_rate(timer_clk);
/* setup clocksource */
- clocksource_davinci.read = read_cycles;
clocksource_davinci.name = id_to_name[clocksource_id];
if (clocksource_register_hz(&clocksource_davinci,
davinci_clock_tick_rate))
printk(err, clocksource_davinci.name);
+ setup_sched_clock(davinci_read_sched_clock, 32,
+ davinci_clock_tick_rate);
+
/* setup clockevent */
clockevent_davinci.name = id_to_name[timers[TID_CLOCKEVENT].id];
clockevent_davinci.mult = div_sc(davinci_clock_tick_rate, NSEC_PER_SEC,